Danny Pop won Motor State this year in a C6Z06 owned by Todd Rumpke. They took the car to VIR for the UTTC. Running in the same trim but with R6's (if I remember correctly) laid down a blistering time for the long track with no aero.
Here is the link to corvette forum with the thread and vid. The vid is a must watch with driver view and track view at the same time with data. No way will I ever be able to drive like that. There is no aero on the car and you can see it dancing around on the long 1.3 mile straight.